Schema:
Ref_Document_Types (document_type_code, document_type_description)
Roles (role_code, role_description)
Addresses (address_id, address_details)
Ref_Document_Status (document_status_code, document_status_description)
Ref_Shipping_Agents (shipping_agent_code, shipping_agent_name, shipping_agent_description)
Documents (document_id, document_status_code, document_type_code, shipping_agent_code, receipt_date, receipt_number, other_details)
Employees (employee_id, role_code, employee_name, other_details)
Document_Drafts (document_id, draft_number, draft_details)
Draft_Copies (document_id, draft_number, copy_number)
Circulation_History (document_id, draft_number, copy_number, employee_id)
Documents_Mailed (document_id, mailed_to_address_id, mailing_date)
Please answer with SQL.